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java.lang.NullPointerException: 	at org.springframework.security.access.expression.method.MethodSecurityEvaluationContext.addArgumentsAsVariables(MethodSecurityEvaluationContext.java:66)	at org.springframework.security.access.expression.method.MethodSecurityEvaluationContext.lookupVariable(MethodSecurityEvaluationContext.java:48)	at org.springframework.expression.spel.ExpressionState.lookupVariable(ExpressionState.java:122)	at org.springframework.expression.spel.ast.VariableReference.getValueInternal(VariableReference.java:52)	at org.springframework.expression.spel.ast.MethodReference.getValueInternal(MethodReference.java:59)	at org.springframework.expression.spel.ast.SpelNodeImpl.getValue(SpelNodeImpl.java:93)	at org.springframework.expression.spel.standard.SpelExpression.getValue(SpelExpression.java:98)	at org.springframework.security.access.expression.ExpressionUtils.evaluateAsBoolean(ExpressionUtils.java:11)	at org.springframework.security.access.expression.method.ExpressionBasedPreInvocationAdvice.before(ExpressionBasedPreInvocationAdvice.java:42)	at org.springframework.security.access.prepost.PreInvocationAuthorizationAdviceVoter.vote(PreInvocationAuthorizationAdviceVoter.java:55)	at org.springframework.security.access.vote.AffirmativeBased.decide(AffirmativeBased.java:50)	at org.springframework.security.access.intercept.AbstractSecurityInterceptor.beforeInvocation(AbstractSecurityInterceptor.java:204)	at org.springframework.security.access.intercept.aopalliance.MethodSecurityInterceptor.invoke(MethodSecurityInterceptor.java:65)	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)	at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:202)	at $Proxy25.create(Unknown Source)